There is another alternative supplier for solar powered lighting too. Check out the video demo here: http://vimeo.com/3403327This is the SunNight Flashlights. You can read the article here: http://venturebeat.com/2009/03/01/sunnights-dual-use-solar-flashlights-play-well-at-greener-gadgets/

In the video they discuss carbon exchanges for putting lights in the hands of people burning kerosene lamps now. Great idea!